How to generate secure random numbers?

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Xiang Xu
Xiang Xu 2024-1-1
编辑： Hassaan 2024-2-23
I use Bcrypt to generate secure random numbers in a C project. It seems that MATLAB 'rand' function only support some pseudorandom algorithm, which is not satisfying. Is there a way to generate secure random numbers with MATLAB (without interact with another programming language)? Will Bcrypt be introduced into MATLAB?
  1 个评论
Dyuman Joshi
Dyuman Joshi 2024-1-1
编辑：Dyuman Joshi 2024-1-2
" (without interact with another programming language) "
Depends on what you mean by interaction.
Secure Random Numbers as a programming concept seems to be only applied in Java, which is implemented below in MATLAB by calling a Java library.

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回答（3 个）

Hassaan
Hassaan 2024-1-1
编辑：Hassaan 2024-1-1
Ran in:
1. Java Security Libraries:
MATLAB doesn't directly run on the JVM, it includes a JVM to enable interaction with Java code and libraries and has built-in support for Java. You can use Java's cryptographic libraries to generate secure random numbers:
% Create a Java SecureRandom object
secureRandom = java.security.SecureRandom();
% Generate secure random numbers
numBytes = 16; % For 128-bit number
randomBytes = zeros(1, numBytes, 'uint8');
for i = 1:numBytes
randomBytes(i) = secureRandom.nextInt(256); % Generates a number between 0 and 255
end
% Convert each byte to a hexadecimal string representation
hexString = dec2hex(randomBytes);
% Concatenate the individual hex strings into one long string
hexString = strcat(hexString(:)');
disp(['Secure Random Hex: ', hexString]);
Secure Random Hex: 5DDF89C9703E37DD343BF18BD3FCFEDE
2. External Libraries via MEX:
If there's a specific cryptographic library or function you want to use (like Bcrypt), you can write a C/C++ program that uses this library and compile it to a MEX file that MATLAB can execute. This is a more advanced solution and requires familiarity with C/C++ and the MEX compilation process.
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If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.
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John D'Errico
John D'Errico 2024-1-2
编辑：John D'Errico 2024-1-2
While this solution may work for now, there is no assurance it will work forever. That is, Java may not be usable from MATLAB forever.
https://www.mathworks.com/help/matlab/matlab_external/java-packages-to-be-removed.html#
(While I hope that is not the case since I depend on Java for one tool of my own, I don't make the decisions.)
Adrián Lascurain
Adrián Lascurain 2024-2-22
Do you have any advice to guarantee access to java security library? I've seen that javaclasspath let you run certain functions of a java class object but I do not have much idea how to implement it.
Thanks beforehand.

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Walter Roberson
Walter Roberson 2024-1-2
Will Bcrypt be introduced into MATLAB?
I very much doubt that Bcrypt will be included into MATLAB.
Is there a way to generate secure random numbers with MATLAB (without interact with another programming language)?
You can urlread() or equivalent to connect to a remote site that serves random numbers.
Hassaan
Hassaan 2024-1-2
编辑：Hassaan 2024-2-23
Ran in:
@Xiang Xu One of the new approach as pointed by @Walter Roberson [special thanks]. The demo usage can be:
% Example URL (replace with the service URL you want to use. For this demo i am using 'www.random.org')
randomNumberServiceURL = 'https://www.random.org/integers/?num=1&min=1&max=100&col=1&base=10&format=plain&rnd=new';
randomNumberServiceURLHex = 'https://www.random.org/integers/?num=1&min=1&max=100&col=1&base=16&format=plain&rnd=new';
% Retrieve a secure random number from the remote service
secureRandomNumber = webread(randomNumberServiceURL);
secureRandomNumberHex = webread(randomNumberServiceURLHex);
disp(['Secure Random: ', secureRandomNumber]);
Secure Random: 26
disp(['Secure Random Hex: ', secureRandomNumberHex]);
Secure Random Hex: 1a
Note:
  • But obviously you need to have internet access to excess this external server URL.
  • base=16 can be provided in the URL for Hex
  • base=10 can be provided in the URL for DEC
  • hex(dec_number) and int(hex_number, 16) can also be used for the respective conversion from one base to another
------------------------------------------------------------------------------------------------------------------------------------------------
If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.
Professional Interests
  • Technical Services and Consulting
  • Embedded Systems
  • Electrical and Electronics Engineering
  2 个评论
Walter Roberson
Walter Roberson 2024-2-23
disp(['Secure Random Hex: ', secureRandomNumber]);
Are you sure the result is Hex? You coded base=10 in the URL.
Hassaan
Hassaan 2024-2-23
@Walter Roberson I missed on that. I have updated my answer. Thank you.

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